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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    function* test () {
      yield 1;
      yield 2;
      yield 3;
      yield 4;
      yield 5;
      return 6;
    }
    for (let v of test()) {
      console.log(v); // 1,2,3,4,5,6
    }
  </script>
</body>

</html>